A class of service in which the ATM network makes a "best effort" to meet the traffic's bit-rate requirements. ABR requires the transmitting end-station to assume responsibility for data that cannot get through and does not guarantee delivery.
Quality of Service class defined by the ATM Forum for ATM networks where a timing relationship is not required between sending and receiving stations.
An ATM service category that is used for data traffic. The ABR categorycan tolerate delays. For each data transmission, ABR negotiates a rangeof acceptable bandwidths and an acceptable cell loss ratio (the number ofcells that can be lost in any transmission).